CVE-2006-0859: Michael Salzer Guestbox 0.6, and other versions before 0.8, allows remote attackers to post an admin comment t

Routine

MEDIUM 5.0DOWNGRADE

CVE-2006-0859 is a medium-severity flaw (CVSS 5.0) affecting guestbox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Michael Salzer Guestbox 0.6, and other versions before 0.8, allows remote attackers to post an admin comment to a guestbook entry via a certain modified form, possibly related to the nummer parameter.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-264
Published	2006-02-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: michael salzer

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-02-23 23:02 UTCPublished CVE record published
2026-06-16 22:21 UTCUpdated Record last modified

michael salzer guestbox DOWNGRADE

Affected: 0.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6

1. Check installed version

apt-cache policy guestbox || rpm -q guestbox || guestbox --version

2. No fixed release: DOWNGRADE to a release before 0.6 (Debian / Ubuntu)

apt-cache madison guestbox sudo apt install guestbox=<VERSION_BEFORE_0.6> sudo apt-mark hold guestbox

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list guestbox sudo dnf downgrade guestbox-<VERSION_BEFORE_0.6> sudo dnf versionlock add guestbox

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-0859?

guestbox: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0859 being exploited?

CVE-2006-0859 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-0859 affect?

CVE-2006-0859 affects guestbox. Severity is medium (CVSS 5.0). Michael Salzer Guestbox 0.6, and other versions before 0.8, allows remote attackers to post an admin comment to a guestbook entry via a certain modified form, possibly related to the nummer parameter.

How urgent is CVE-2006-0859?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2006-0861 MEDIUM 5.0 DOWNGRADE Michael Salzer Guestbox 0.6, and other versions before 0.8, allows remote attackers to obtain the source IP ad
CVE-2006-0860 MEDIUM 4.3 DOWNGRADE Multiple cross-site scripting (XSS) vulnerabilities in Michael Salzer Guestbox 0.6, and other versions before

References

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